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Published 10:47 23 Apr 2017 BST
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Leinster can take heart from three things.
"Leinster's greatest challenge will be about stopping Clermont's momentum. You look at how they start games and the players they have...."Clermont's attacking play is formidable. They have huge players, many of whom have the abilities of pace, power and offloading.
Leinster's defence will be key and O'Gara believes that if Leo Cullen's side can keep their penalty count down, they will have a great chance of emerging with a victory.
"But for me it will come down to discipline and who's going to give away cheap penalties and I think Clermont have the capacity to implode more than Leinster do."Two attacking sides. European Cup semi-final. It's going to be a cracker.

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